Flow switch



FIG. 1 is a top view of the flow switch showing my design;

FIG. 2 is a bottom view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a left side view thereof; and,

FIG. 7 is right side perspective view thereof. 

We claim the ornamental design for a flow switch, as shown and described. 